Corrosion Behavior of Weld Joint of 690 MPa Weathering Bridge Steel in Simulated Industrial Atmosphere

doi:10.11902/1005.4537.2022.104

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (1): 95-103 DOI: 10.11902/1005.4537.2022.104

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Corrosion Behavior of Weld Joint of 690 MPa Weathering Bridge Steel in Simulated Industrial Atmosphere

CHENG Peng¹^,², LIU Jing¹(

), MU Wenguang², HUANG Feng¹, HUANG Xianqiu², PANG Tao²

^1.State Key Laboratory of Refractories and Metallurgy, Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Central Research Institute, BaoShan Iron&Steel Co. Ltd., Wuhan 430081, China

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Abstract

The corrosion behavior of weld joint of 690 MPa weathering bridge steel in simulated industrial atmosphere was investigated by periodic accelerated corrosion test, coupled with electrochemical test, scanning electron microscope (SEM), electron probe microanalyzer (EPMA) and other surface characterization techniques. The results show that in the early stage of corrosion, due to the difference of microstructure, the corrosion resistance of the weld zone composed mainly of ferrite is better than that of the base material composed mainly of bainite, the heat affected zone with bainite microstructure has the worst corrosion resistance due to the coarsened and non-uniformly distributed grains, however the potential difference between different areas of the welded joint does not cause galvanic corrosion. In the later stage of corrosion, Cu and Cr are obviously enriched in the rust layer in different areas of the welded joint, while Ni content in the rust layer at the weld zone is much higher than that at the base metal zone and the heat affected zone. Due to the large alloying element content in the weld zone, where the rust layer is more smooth and compact and has higher polarization resistance and impedance value，which may result in better corrosion resistance of the whole welded joint rather than the base metal.

Key words: weathering bridge steel weld joint industrial atmospheric

Received: 11 April 2022 32134.14.1005.4537.2022.104

ZTFLH:

TG174

Fund: National Key Research and Development Program of China(2017YFB030480)

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	Peng CHENG
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	Wenguang MU
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	Tao PANG

Cite this article:

CHENG Peng, LIU Jing, MU Wenguang, HUANG Feng, HUANG Xianqiu, PANG Tao. Corrosion Behavior of Weld Joint of 690 MPa Weathering Bridge Steel in Simulated Industrial Atmosphere. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 95-103.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.104 OR https://www.jcscp.org/EN/Y2023/V43/I1/95

Table 1 Chemical compositions of Q690qENH steel and weld joint (mass fraction / %)

Fig.1 Schematic diagram of sampling locations

Fig.2 Microstructural images of Q690qENH weld joint of BM (a), WM (b) and HAZ (c)

Fig.3 Schematic diagram of scanning area (a) and SKP image (b) of Q690qENH steel welded joint

Fig.4 Corrosion morphologies of Q690qENH steel (a, c) and its weld joint (b, d) before (a, b) and after (c, d) pickling

Fig.5 SEM surface morphologies of the welded joint of Q690qENH steel after corrosion for 384 h: (a, b) BM, (c, d) WM, (e, f) HAZ

Fig.6 Cross-sectional morphologies and element distributions of the different zones of the welded joint after 384 h corrosion of BM (a), WM (b) and HAZ (c)

Fig.7 Variations of open circuit potentials of the different zones of welded joint with time

Fig.8 Linear polarization curves of the BM (a), WM (b) and HAZ (c) of weld joint and their R_p values

Fig.9 EIS of the different zones of weld joint after corrosion for 0 h (a), 96 h (b), 192 h (c) and 384 h (d) and equivalent circuit for EIS of weld joint after corrosion for 0 h (e), and 96, 192 and 384 h (f)

Table 2 Fitting results of EIS of the samples after corrosion for different time (Ω·cm²)

Fig.10 Low-frequency impedances at 0.01 Hz for the different zones of weld joint after corrosion for different time

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